Today, a major milestone was achieved in Delhi Metro’s Phase 4 construction work as the first-ever tunneling stretch of the Phase 4 project was completed at Krishna Park Extension on the Janakpuri West-RK Ashram Marg corridor with a 73 metre long Tunnel Boring Machine (TBM) breaking through after boring a 1.4 km long tunnel. On this stretch, the main tunneling work was commenced earlier this year in the month of April after the initial drive’s completion. Despite the many Covid constraints, work was continued and this major milestone could be achieved, according to a statement issued by Delhi Metro Rail Corporation (DMRC).
On this stretch, two parallel circular tunnels for up-down movement are being built which is a part of the 2.2 km long Janakpuri West-Keshopur underground section. Soon, tunneling work on the other parallel tunnel shall commence, DMRC stated. This new Delhi Metro’s tunnel is a continuation of the earlier tunnel of the Magenta line that was already developed for the currently operational Botanical Garden-Janakpuri West corridor. The construction of the tunnel has been done approximately at a depth of 14 to 16 metres. More than a thousand rings have been installed in the newly developed tunnel. It has 5.8 metres inner diameter. The tunnel’s alignment runs along the Outer ring road and below the multi-storied built-up structures.
